CO mystery - any ideas?

Check for any cracks at the joint of the pipe and the flange that bolts
to the head. Also at the joint between the muffler and the riser if
you have one.


"Andrew Gideon" wrote in message
online.com...
Our Cessna R182 is getting CO in the cockpit. We've now had three
different
shops look at it multiple times, all to no (complete) effect. They've
done
things like resealing the firewall, the gear-wells, the exhaust, and the
like. But still we get CO.

We've swapped CO detectors around between planes, so the detectors'
results
are trusted.

One interesting oddity: turning cabin heat on does seem to get rid of the
CO.

We've noticed no difference made between type of flight. I personally
have
had readings both while XC and while maneuvering (practicing commercial
maneuvers), and at various altitudes. Others have reported the same.

At this point, we're at something of a loss. The next thing we're trying
is
to extend the exhaust pipe. The presumption is that this would get the CO
into the slipstream and away. But that "presumption" is really more of a
"guess" or even a "hope".

Anyone have any suggestions or ideas or experiences that might help us?

Thanks...

Andrew

OtisWinslow wrote:

Check for any cracks at the joint of the pipe and the flange that bolts
to the head. Also at the joint between the muffler and the riser if
you have one.

*Everything* forward of the firewall has been checked, and much of it
resealed, a couple of times. That's why I'm looking for something "else".

But thanks...

Andrew

P.S. Since we're on the subject, though: "the head" of what?

"Andrew Gideon" wrote in message
online.com...
OtisWinslow wrote:

Check for any cracks at the joint of the pipe and the flange that bolts
to the head. Also at the joint between the muffler and the riser if
you have one.

*Everything* forward of the firewall has been checked, and much of it
resealed, a couple of times. That's why I'm looking for something "else".

But thanks...

Andrew

P.S. Since we're on the subject, though: "the head" of what?


Cylinder head? doh!

allen

Andrew Gideon wrote:
OtisWinslow wrote:


Check for any cracks at the joint of the pipe and the flange that bolts
to the head. Also at the joint between the muffler and the riser if
you have one.


*Everything* forward of the firewall has been checked, and much of it
resealed, a couple of times. That's why I'm looking for something "else".

The only time I get CO in the Navion cockpit is when sitting on the ground
with the canopy open pointed into the wind.